/*
** Nofrendo (c) 1998-2000 Matthew Conte (matt@conte.com)
**
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of version 2 of the GNU Library General
** Public License as published by the Free Software Foundation.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
** Library General Public License for more details.  To obtain a
** copy of the GNU Library General Public License, write to the Free
** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
** Any permitted reproduction of these routines, in whole or in part,
** must bear this legend.
**
**
** map229.c
**
** Mapper #229 (31 in 1)
** Implementation by Firebug
** Mapper information courtesy of Mark Knibbs
** $Id: map229.c,v 1.2 2001/04/27 14:37:11 neil Exp $
**
*/

#include <noftypes.h>
#include <nes_mmc.h>
#include <nes.h>
#include <libsnss.h>
#include <log.h>

/************************/
/* Mapper #229: 31 in 1 */
/************************/
static void map229_init(void)
{
    /* On reset, PRG is set to first 32K and CHR to first 8K */
    mmc_bankrom(32, 0x8000, 0x00);
    mmc_bankvrom(8, 0x0000, 0x00);

    /* Done */
    return;
}

/*******************************************/
/* Mapper #229 write handler ($8000-$FFFF) */
/*******************************************/
static void map229_write(uint32 address, uint8 value)
{
    /* Value written is irrelevant */
    UNUSED(value);

    /* A4-A0 sets 8K CHR page */
    mmc_bankvrom(8, 0x0000, (uint8)(address & 0x1F));

    /* If A4-A1 are all low then select the first 32K,     */
    /* otherwise select a 16K bank at both $8000 and $C000 */
    if ((address & 0x1E) == 0x00)
    {
        mmc_bankrom(32, 0x8000, 0x00);
    }
    else
    {
        mmc_bankrom(16, 0x8000, (uint8)(address & 0x1F));
        mmc_bankrom(16, 0xC000, (uint8)(address & 0x1F));
    }

    /* A5: mirroring (low = vertical, high = horizontal) */
    if (address & 0x20)
        ppu_mirror(0, 0, 1, 1);
    else
        ppu_mirror(0, 1, 0, 1);

    /* Done */
    return;
}

static map_memwrite map229_memwrite[] = {{0x8000, 0xFFFF, map229_write}, {-1, -1, NULL}};

mapintf_t map229_intf = {
    229,                 /* Mapper number */
    "31 in 1 (bootleg)", /* Mapper name */
    map229_init,         /* Initialization routine */
    NULL,                /* VBlank callback */
    NULL,                /* HBlank callback */
    NULL,                /* Get state (SNSS) */
    NULL,                /* Set state (SNSS) */
    NULL,                /* Memory read structure */
    map229_memwrite,     /* Memory write structure */
    NULL                 /* External sound device */
};

/*
** $Log: map229.c,v $
** Revision 1.2  2001/04/27 14:37:11  neil
** wheeee
**
** Revision 1.1  2001/04/27 12:54:40  neil
** blah
**
** Revision 1.1  2001/04/27 10:57:41  neil
** wheee
**
** Revision 1.1  2000/12/30 06:34:31  firebug
** Initial revision
**
**
*/
